Weird orbit glitch

This glitch has happened on 3 seperate occasions. It only appears to happen around the planet I edited named Exia (name I gave to it). The planet itself is nohing too unusual, a distant rocky planet with thin rings and minor moons. The glitch occurs when trying to enter orbit. When trying to do so, the velocity will plummet from a modest 2600 m/s on average to anywhere from 45 m/s to straight up 0 m/s. It shows it is in orbit, a very elliptical one, but when seeing a craft actually move, it is circular and appears to orbit nothing. Not sure what is happening and or how to fix it, Be nice to to have it fixed so I can explore the planet.